| Parameter |
Value |
| Designation |
74P/Smirnova-Chernykh |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-07-26T18:53:38.227200Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T15:24:14Z |
| Obs used |
6028 |
| NEO |
- |
| M1 |
6.700 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-01-30.0000000 |
| e |
0.14785301 |
| q (au) |
3.549250 |
| a (au) |
4.165067 |
| i (deg) |
6.651004 |
| Ω (om, deg) |
77.083800 |
| ω (w, deg) |
86.558859 |
| M (ma, deg) |
148.788615 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.747 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.747 |
| n |
6.000 |
| gf |
0.904 |
| gb |
-0.986 |
| k |
1.000 |
| δ90 |
1.005 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
06:37:58.60 |
+28:27:24.5 |
HIP 31767 |
15.64 |
| 2026-03-26 12:00 |
06:38:09.58 |
+28:26:52.2 |
HIP 31767 |
14.92 |
| 2026-03-27 00:00 |
06:38:20.76 |
+28:26:19.8 |
HIP 31767 |
14.57 |
| 2026-03-27 12:00 |
06:38:32.16 |
+28:25:47.2 |
HIP 31856 |
14.28 |
| 2026-03-28 00:00 |
06:38:43.75 |
+28:25:14.5 |
HIP 31856 |
11.68 |
| 2026-03-28 12:00 |
06:38:55.55 |
+28:24:41.5 |
HIP 31856 |
9.03 |
| 2026-03-29 00:00 |
06:39:07.56 |
+28:24:08.3 |
HIP 31856 |
6.35 |
| 2026-03-29 12:00 |
06:39:19.76 |
+28:23:35.0 |
HIP 31856 |
3.64 |
| 2026-03-30 00:00 |
06:39:32.16 |
+28:23:01.5 |
HIP 31856 |
1.05 |
| 2026-03-30 12:00 |
06:39:44.76 |
+28:22:27.8 |
HIP 31856 |
2.16 |
| 2026-03-31 00:00 |
06:39:57.56 |
+28:21:54.0 |
HIP 31856 |
4.97 |
| 2026-03-31 12:00 |
06:40:10.55 |
+28:21:19.9 |
HIP 31856 |
7.86 |
| 2026-04-01 00:00 |
06:40:23.74 |
+28:20:45.7 |
HIP 31856 |
10.81 |
| 2026-04-01 12:00 |
06:40:37.12 |
+28:20:11.3 |
HIP 32019 |
12.78 |
| 2026-04-02 00:00 |
06:40:50.69 |
+28:19:36.7 |
HIP 32019 |
10.26 |
| 2026-04-02 12:00 |
06:41:04.46 |
+28:19:01.9 |
HIP 32019 |
8.09 |
| 2026-04-03 00:00 |
06:41:18.41 |
+28:18:26.9 |
HIP 32019 |
6.67 |
| 2026-04-03 12:00 |
06:41:32.55 |
+28:17:51.8 |
HIP 32019 |
6.59 |
| 2026-04-04 00:00 |
06:41:46.88 |
+28:17:16.5 |
HIP 32019 |
7.92 |
| 2026-04-04 12:00 |
06:42:01.40 |
+28:16:40.9 |
HIP 32019 |
10.17 |
| 2026-04-05 00:00 |
06:42:16.11 |
+28:16:05.2 |
HIP 32019 |
12.89 |
| 2026-04-05 12:00 |
06:42:30.99 |
+28:15:29.3 |
HIP 32019 |
15.88 |
| 2026-04-06 00:00 |
06:42:46.07 |
+28:14:53.2 |
HIP 32225 |
14.71 |
| 2026-04-06 12:00 |
06:43:01.32 |
+28:14:17.0 |
HIP 32225 |
12.74 |
| 2026-04-07 00:00 |
06:43:16.76 |
+28:13:40.5 |
HIP 32225 |
11.45 |
| 2026-04-07 12:00 |
06:43:32.37 |
+28:13:03.9 |
HIP 32225 |
11.12 |
| 2026-04-08 00:00 |
06:43:48.17 |
+28:12:27.0 |
HIP 32225 |
11.86 |
| 2026-04-08 12:00 |
06:44:04.14 |
+28:11:50.0 |
HIP 32279 |
10.92 |
| 2026-04-09 00:00 |
06:44:20.29 |
+28:11:12.7 |
HIP 32279 |
10.93 |
| 2026-04-09 12:00 |
06:44:36.62 |
+28:10:35.3 |
HIP 32279 |
12.09 |
| 2026-04-10 00:00 |
06:44:53.12 |
+28:09:57.6 |
HIP 32279 |
14.15 |
| 2026-04-10 12:00 |
06:45:09.79 |
+28:09:19.8 |
HIP 32279 |
16.81 |
| 2026-04-11 00:00 |
06:45:26.64 |
+28:08:41.8 |
HIP 32279 |
19.84 |
| 2026-04-11 12:00 |
06:45:43.66 |
+28:08:03.5 |
HIP 32448 |
20.75 |
| 2026-04-12 00:00 |
06:46:00.85 |
+28:07:25.1 |
HIP 32448 |
18.95 |
| 2026-04-12 12:00 |
06:46:18.21 |
+28:06:46.4 |
HIP 32448 |
17.81 |
| 2026-04-13 00:00 |
06:46:35.74 |
+28:06:07.6 |
HIP 32448 |
17.48 |
| 2026-04-13 12:00 |
06:46:53.44 |
+28:05:28.5 |
HIP 32448 |
18.03 |
| 2026-04-14 00:00 |
06:47:11.30 |
+28:04:49.3 |
HIP 32448 |
19.41 |
| 2026-04-14 12:00 |
06:47:29.33 |
+28:04:09.8 |
HIP 32448 |
21.49 |
| 2026-04-15 00:00 |
06:47:47.52 |
+28:03:30.1 |
HIP 32694 |
21.96 |
| 2026-04-15 12:00 |
06:48:05.88 |
+28:02:50.2 |
HIP 32694 |
18.11 |
| 2026-04-16 00:00 |
06:48:24.39 |
+28:02:10.1 |
HIP 32694 |
14.36 |